function isCardNo(card) {
  // 身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X
  var reg = /(^\d{15}$)|(^\d{17}(\d|X|x)$)/;
  if (reg.test(card) === false) {
    return false;
  }
  return true;
}

function checkProvince(card, vcity) {
  var province = card.substr(0, 2);
  if (vcity[province] == undefined) {
    return false;
  }
  return true;
}

function checkBirthday(card) {
  var len = card.length;
  // 身份证15位时，次序为省（3位）市（3位）年（2位）月（2位）日（2位）校验位（3位），皆为数字
  if (len == '15') {
    var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/;
    var arr_data = card.match(re_fifteen);
    var year = arr_data[2];
    var month = arr_data[3];
    var day = arr_data[4];
    var birthday = new Date('19' + year + '/' + month + '/' + day);
    return verifyBirthday('19' + year, month, day, birthday);
  }
  // 身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X
  if (len == '18') {
    var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X|x)$/;
    var arr_data = card.match(re_eighteen);
    var year = arr_data[2];
    var month = arr_data[3];
    var day = arr_data[4];
    var birthday = new Date(year + '/' + month + '/' + day);
    return verifyBirthday(year, month, day, birthday);
  }
  return false;
}

function verifyBirthday(year, month, day, birthday) {
  var now = new Date();
  var now_year = now.getFullYear();
  // 年月日是否合理
  if (birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day) {
    // 判断年份的范围（0岁到100岁之间)
    var time = now_year - year;
    if (time >= 0 && time <= 100) {
      return true;
    }
    return false;
  }
  return false;
}

function checkParity(card) {
  // 15位转18位
  card = changeFivteenToEighteen(card);
  var len = card.length;
  if (len == '18') {
    var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
    var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
    var cardTemp = 0; var i; var valnum;
    for (i = 0; i < 17; i++) {
      cardTemp += card.substr(i, 1) * arrInt[i];
    }
    valnum = arrCh[cardTemp % 11];
    if (valnum == card.substr(17, 1).toLocaleUpperCase()) {
      return true;
    }
    return false;
  }
  return false;
}

function changeFivteenToEighteen(card) {
  if (card.length == '15') {
    var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
    var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
    var cardTemp = 0; var i;
    card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6);
    for (i = 0; i < 17; i++) {
      cardTemp += card.substr(i, 1) * arrInt[i];
    }
    card += arrCh[cardTemp % 11];
    return card;
  }
  return card;
}

export default function validateIdCard(idCard) {
  var vcity = {
    11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "内蒙古",
    21: "辽宁", 22: "吉林", 23: "黑龙江", 31: "上海", 32: "江苏",
    33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山东", 41: "河南",
    42: "湖北", 43: "湖南", 44: "广东", 45: "广西", 46: "海南", 50: "重庆",
    51: "四川", 52: "贵州", 53: "云南", 54: "西藏", 61: "陕西", 62: "甘肃",
    63: "青海", 64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门", 91: "国外"
  };
  // 是否为空
  if (idCard === '') {
    return false;
  }
  // 校验长度，类型
  if (isCardNo(idCard) === false) {
    return false;
  }
  // 检查省份
  if (checkProvince(idCard, vcity) === false) {
    return false;
  }
  // 校验生日
  if (checkBirthday(idCard) === false) {
    return false;
  }
  // 检验位的检测
  if (checkParity(idCard) === false) {
    return false;
  }
  return true;
}
